Analog/ digital phones- phone systems

Hi guys,
Just got a general question. When I walk into a environment, how do I find the phones are whether digital or analog ? Any way to find by looking at into phones ?
If phones has Ethernet cable , they are ip Phones. Like wise how do I differentiate between analog/ digital ?
What is sip trunk ?

A very simple approach is to note the manufacturer name and model and do a Google search on them. That should tell you plenty about their interface.
If the jack on the phone is labeled "Ethernet" or has a network icon, you can assume that they are IP phones. If it mentions Line 1/Line 2, you can assume that they are analog. Otherwise, they are likely (but not certainly) digital.
SIP refers to a very common standard of IP phones.

Most PBX's with digital interfaces (Panasonic, Avaya, Nortel, etc) will typically have line 1-whatever (or more) indicated on the phones button layout card. They will also be using the standard phone cords

Aside from identifying VOIP's via Ethernet cables, the only reliable option is to google the phone model

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Yes, you could do that, but you also would need to have some firewall rules set up to ensure that your IP PBX communicates properly.

But also note that you can have a PBX that can have digital or analog phones, and use a SIP trunk for calls outside of the organization. Conversely, you could have a PBX that works with IP phones, and use a T1 or PRI for outside calls.

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Mr.XAuthor Commented: 2018-02-21

What u mean by sip trunk ??
And does it mean for phone calls I don't need to pay anything.It's all with internet payment ?
What does it mean like sip registration with isp ??

If your phone system utilizes VoIP, SIP trunks come into play. What is a SIP trunk? Its purpose is taking calls from your phone system, over the internet, to a provider whose equipment interfaces with the public telephone network (assuming that the other party doesn't have VoIP). Since the SIP trunk provider doesn't have the cost of maintaining traditional telephony equipment between your location and their office, that's why you see calls made through SIP trunks actually cost less.

Basically, think of that trunk as a SIP internet-based telephone service. You still have to pay for it.

SIP registration is basically signing in. So when a phone registers with a PBX, it is authenticating to be able to make phone calls. PBX systems using SIP trunks register with the SIP trunk provider to be able to make/receive calls through the SIP trunk.

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Mr.XAuthor Commented: 2018-02-21

I guess to make sip trunk calls, either I need to press 0 or line number before dialing out the number.

If I make a normal call without pressing 0 or line number. What call is that ? I mean is there any name like sip trunk call ? And does it still work over internet ? Am very new to phone systems. So this might be a wrong question too.

I think it would serve you best to figure out what type of PBX exists first, then we can determine what might be your best course of action based on your goals. I assume there is a phone or telco room somewhere there.

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